[hpsdr] Mercury and 28Mhz receive

[Riho B., ES7AAZ]

Hi,

I can confirm that, but these are not so strong  I'm using clamp on 
choke right
after Mercury input.  Removing that choke makes spurious bigger, even 
non-moving
0Hz spurious is bigger without the choke.


Ozy 1.9
Mercury  2.9
Penelope 1.4
PowerSDR 2.2.3


73's,
Riho, ES7AAZ.

26.09.2011 13:00, Helmut Oeller kirjutas:
> ***** High Performance Software Defined Radio Discussion List *****
>
>
>
> Hi Mike,
>
> I can confirm the same ,phenomenon', using mercury_eu (V6.4) and Joe's 
> 1.9.3.4 diversity20 (10AUG2011).
>
> 73 Helmut, DC6NY
>
> *Von:*hpsdr-bounces at lists.openhpsdr.org 
> [mailto:hpsdr-bounces at lists.openhpsdr.org] *Im Auftrag von *Mike Stevenson
> *Gesendet:* Montag, 26. September 2011 11:25
> *An:* hpsdr at lists.openhpsdr.org
> *Betreff:* [hpsdr] Mercury and 28Mhz receive
>
> I have been spending quite a lot of time operating on
>
> 10m now is open again.
>
> There has always been a higher level of spurious signals on this band 
> than any other even with Mercury input terminated directly in 50 ohms.
>
> What I am now seeing  using Doug's, W5WC software with zero frequency 
> IF is between about 28.300 and 28.650 a spurious signal at 0Hz in the 
> receive pass band.
>
> Also I am hearing what sounds like intermod produced by other signals 
> in the display pass band producing an audible output. I have see the 
> effect produce by signal of only S7. Also at the same time I see the 
> 0Hz spurious being modulated by the off frequency S7 signal.
>
> The above applies to Doug's software 1.19.3.4, 1.19.3.5 and 2.2.3.
>
> Using Bill's KD5TFD software with 9Khz IF I see much the same spurious 
> on the spectrum display but 0Hz spurious is offset by 9Khz and so far 
> have not detected any unwanted products in the audio output.
>
> Current cards
>
> Mercury  V2.9
>
> Pennylane  V1.4
>
> Metis   V1.4
>
> Excalibur
>
> Alex
>
> Has anyone else seen this or do I have a one off problem.
>
> Mike G8ALS
>
>
>
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